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[1]MA Yali,NIU Zuirong,ZHANG Rui,et al.Temporal and Spatial Evolution and Driving Factors of Potential Evapotranspiration in Shule River Basin[J].Research of Soil and Water Conservation,2022,29(05):350-357.

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Temporal and Spatial Evolution and Driving Factors of Potential Evapotranspiration in Shule River Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 05 Page number: 350-357 Column: Public date: 2022-08-20

Title:: Temporal and Spatial Evolution and Driving Factors of Potential Evapotranspiration in Shule River Basin

Author(s):: MA Yali¹, NIU Zuirong¹, ZHANG Rui¹, SUN Dongyuan¹, CHENG Jinna², BAI Zuhui²; (1.College of Water Resources and Hydropower Engineering, Gansu Agricultural University, Lanzhou 730070, China; 2.Gansu Survey and Design Research Institute for Water Resources and Hydropower Limited Liability Company, Lanzhou 730030, China)

Keywords:: potential evapotranspiration; driving factors; climate change; quantitative relationship; Shule River Basin

CLC:: P426

DOI:: -

Abstract:: In order to explore the temporal and spatial variation of ET₀ and its complex interaction with meteorological factors, and reveal the response mechanism of climate change to hydrological cycle, based on the daily data of ten meteorological stations in Shule River Basin from 1984 to 2019, a variety of qualitative and quantitative analysis methods were used to determine the dominant meteorological elements, and to explore the sensitivity and contribution of the dominant factors to ET₀ changes, including cluster analysis, grey correlation analysis, path analysis, sensitivity coefficient method. The results show that the interannual variation of ET₀ presented a significant upward trend, and it gradually increased from southeast to northwest spatially; ET₀ in summer was the largest, followed by spring and autumn, while the smallest was observed in winter; ET₀ increased gradually from southeast to northwest in four seasons. The results of cluster analysis and grey correlation analysis showed that T(average daily temperature), RH(average relative humidity), P(precipitation), n(sunshine duration), and u(wind speed)were the five key meteorological factors, T was the most important factor, and P played the least role. For the change of ET₀, T, n and u had a positive promoting effect, while RH had a negative inhibiting effect. The contribution rates were 7.96%, 0.29%,3.14% and 2.29%, respectively. ET₀ in Shule River Basin showed an increasing trend, which was due to the joint action of decreasing RH and increasing T, n and u over the years. The the increase of ET₀ was mainly due to the increase of T. The study of ET₀ variation mechanism in Shule River Basin can provide methods and theories of ET₀ research and a scientific reference for the rational and efficient utilization of water resources in Hexi arid area.

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Last Update: 2022-08-20